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We currently deep link to "chrome://os-settings/lanugages" which will
bring us to the languages section of top-level OS settings. The subpage
that is DCHECKed against is "chrome://os-settings/languages/details"
which will actually load the languages subpage.

We will now deep link to the actual subpage.

Bug: b:148303041
Change-Id: I4498e25d30dd890e43b8562a998d832cff4ea18e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023467Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#735501}